sticky plaque with more brush movements than manual brushes and even up to 50% more than leading sonic technology brushes for a superior clean. oral-b power brushes. go to oralb.com for the latest offers. >>> president obama has a slough of big issues and big challenges on deck as he moves into a second term. one of the biggest priorities on the foreign front, ongoing instability in syria and concerns about iran's nuclear program. also creating new paths to citizenship with a renewed push for immigration reform and negotiating with the gop as america nears the edge of its fiscal cliff. one of the most pressing is a house keeping issue. restocking his cabinet. questions now are who's staying, who's going. nbc's kristen we will kerr is live for us at the white house with more on this. kristen, a lot of talk has been bouncing around over who the potential people are that might be leaving and who might be coming in. what do we know definitively about who is on the fence? >> hey, good morning, thomas. just to be clear, i don't think president obama has made any definitive decisions, but there have bee